Because some of us like to look nice, not necessarily for others.
Because wearing a dress that makes me look as wide as I am tall would make me feel strange
I wear things that I like wearing. The big puffy sleeves and width, and the low V neck aren't what I like.
I have dresses that are bright and cheerful, and I have dresses that I feel like $1m dollars in, and something unflattering wouldn't. Neither the shape or colour of it would suit me.